MJ-18 Issues

[turtles1118 1]

Well i got my MJ-18 4ohm last week or so and i had the day off today so i made a box for it, 26 in. wide, 23in. high, 18in. deep, box volume 4.52 (ft3), tuned to 25 hz, 3?4 M.D.F. and no stuffing. Well, when i used an amp that i had pushing a C.V. 15in., just a plain 300 watt 4ohm plate amp and it did dent sound good at all, put the amp back to the 15 and it sounded great. Hooked up the 18 to a amp in my truck and still sounded like crap. What to do What to do?

I put a few pics up in the subs area.

Edited May 31, 2007 by turtles1118

[mlstrass 1]

Well i got my MJ-18 4ohm last week or so and i had the day off today so i made a box for it, 26 in. wide, 23in. high, 18in. deep, box volume 4.52 (ft3), tuned to 25 hz, 3?4 M.D.F. and no stuffing. Well, when i used an amp that i had pushing a C.V. 15in., just a plain 300 watt 4ohm plate amp and it did dent sound good at all, put the amp back to the 15 and it sounded great. Hooked up the 18 to a amp in my truck and still sounded like crap. What to do What to do?

I put a few pics up in the subs area.

Possibly major air leaks in the box, tuning isn't what you thought it was, sub wired up wrong??

Why did you go with a 25Hz tune? Just asking as I'm not familiar with what guys are tuning the MJ's to for HT.

"Most" DIY HT subs are usually tuned under 20Hz it seems...

[Aaron Clinton 2,372]

Let me move this to the Mach5 section.

[///M5 2,833]

Can you post some pics as well as describe your port in more detail?

[turtles1118 1]

Well i got my MJ-18 4ohm last week or so and i had the day off today so i made a box for it, 26 in. wide, 23in. high, 18in. deep, box volume 4.52 (ft3), tuned to 25 hz, 3?4 M.D.F. and no stuffing. Well, when i used an amp that i had pushing a C.V. 15in., just a plain 300 watt 4ohm plate amp and it did dent sound good at all, put the amp back to the 15 and it sounded great. Hooked up the 18 to a amp in my truck and still sounded like crap. What to do What to do?

I put a few pics up in the subs area.

Possibly major air leaks in the box, tuning isn't what you thought it was, sub wired up wrong??

Why did you go with a 25Hz tune? Just asking as I'm not familiar with what guys are tuning the MJ's to for HT.

"Most" DIY HT subs are usually tuned under 20Hz it seems...

Well I went with 25 hz. so i could get the best of both worlds H/T, and music. Added some stuffing to it and rounded the port a little more and wa la, sounds great even with a 7 year old cheap ass 300 watt plate amp. but thanks to all for the help and hope to talk soon.

turtles1118

Edited June 1, 2007 by turtles1118

[mrogowski 6]

Glad to hear things worked out for you. Sounds like the stuffing made a diiference...

Best,

Mark